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On Mar 2, 2012, at 6:44 AM, Tony Finch wrote:

> Axel Kittenberger <axkibe@gmail.com> wrote:
>> 
>> I cannot make any circles with immutables!
> 
> You can, for example in ML,
> 
> 	val rec xs = 1 :: xs

With lazy languages, you can make more complex circular structures.

http://www.haskell.org/haskellwiki/Tying_the_Knot

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